Future policy uncertainty is an important source of public inflation expectations. Based on this, this article establishes a VAR model with time-varying parameters (TVP-SV-VAR),then analyzes how policy uncertainty is applied to public inflation expectations, and defines the explanatory power of the influence path of central bank communication on public inflation expectations through reducing policy uncertainty. The results show that: first, the rise in policy uncertainty will raise public inflation expectations, which is mainly due to the loose-type policy preferences of policymakers under the high policy uncertainty; second, a one-point increase in central bank communication will reduce policy uncertainty by a maximum of 10 points, while the drop of 1 point in policy uncertainty will reduce public inflation expectations by a maximum of 0.003 points; third, a one-point increase in central bank communication will reduce public inflation expectations by a maximum of 0.1 points. The explanatory power of the assumption that central bank communication realizes the regulation of public inflation expectations by reducing policy uncertainty is obviously insufficient. It would be a beneficial attempt to deepen the central bank communication and improve the transparency of other policies in the future in hope of reducing policy uncertainty and stabilizing public inflation expectations.